<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .w{
            width: 1200px;
            height: 600px;
            margin: auto;
            background-color: tomato;
        }
        .k{
            width: 400px;
            height: 600px;
            float: left;
            background-color: violet;
        }
        .a{
            width: 500px;
            height: 600px;
            background-color: yellow;
            float: right;
        }
    </style>
</head>
<body>
    <div class="w">
        <div class="k">
            <span>5</span>
        </div>
        <div class="a">
            <p>6</p>
        </div>
    </div>
</body>
</html>